package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.constant.WeChatConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.time.LocalDateTime;
import java.util.HashMap;

@Slf4j
@Service
public class UserServiceImpl implements UserService {
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) throws IOException {
        //调用微信服务接口，获取当前微信用户openId
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openId是否为空，如果为空则登录失败，抛出业务异常
        if(openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);
        //如果是新用户，自动完成注册
        if(user == null){
             user = User.builder()
                     .openid(openid)
                     .createTime(LocalDateTime.now())
                     .build();
            userMapper.insert(user);
        }


        //返回这个用户对象
        return user;
    }
    private String getOpenid(String code) throws IOException {

        HashMap<String, String> entity = new HashMap<>();
        entity.put(WeChatConstant.APPID,weChatProperties.getAppid());
        entity.put(WeChatConstant.SECRET,weChatProperties.getSecret());
        entity.put(WeChatConstant.JS_CODE,code);
        entity.put(WeChatConstant.GRANT_TYPE,"authorization_code");
        String response = HttpClientUtil.doPost(WX_LOGIN, entity);

        JSONObject jsonObject = JSON.parseObject(response);
        return jsonObject.getString("openid");
    }
}
